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采用水热法制备了富含(001)晶面的锐钛矿型TiO2纳米片,并通过改变热处理过程中NH3流速制备不同N掺杂浓度的TiO2纳米片.运用X射线衍射、场发射扫描电镜、高分辨率透射电子显微镜、紫外-可见漫反射光谱、X射线光电子能谱和荧光光谱对光催化剂进行了结构和性能表征,并以罗丹明B为目标降解物,考察了N掺杂浓度对TiO2纳米片可见光催化活性的影响.结果表明,NH3流速为40ml/min时制备的N掺杂TiO2纳米片具有最低的光生电子-空穴复合速率,最高的OH产生能力并表现出最高的光催化活性.同时,讨论了N掺杂浓度对TiO纳米片可见光催化活性影响的机理.
Anatase TiO2 nanosheets rich in (001) crystal planes were prepared by hydrothermal method and different concentrations of N-doped TiO2 nanosheets were prepared by changing NH3 flow rate during the heat treatment.Using X-ray diffraction, field emission scanning electron microscopy , High resolution transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy and fluorescence spectroscopy were used to characterize the structure and properties of the photocatalyst. Rhodamine B was used as the degradation target. The effect of N doping concentration The results showed that N-doped TiO2 nanosheets prepared at NH3 flow rate of 40ml / min had the lowest photo-induced electron-hole recombination rate, the highest OH generation capacity and the highest photocatalytic activity At the same time, the mechanism of the influence of N doping concentration on the photocatalytic activity of TiO nanosheets was discussed.